Truss analysis with Matlab

Hello, I have been working on this Truss problem and have not managed to get it right. I have checked my equations over and over and everything seems to check out, but I only get 4/24 on the autograder.

Here is my paper worked out.

Here is my Code. Because I don't like the opposite sign convention from the problem statement, I just used the normal sign convention and multiplied by -1, -(A\b). Whether I keep it -(A\b) or A\b, I still get 4/24 points.